Method of manufacturing a plastic sleeve

Abstract

A method of manufacturing a plastic sleeve, particularly an expanding sleeve, includes injection molding the plastic sleeve with an inserted core in an injection molding tool, subsequently pulling the core and inserting the metal pin without heads, cones or the like into the bore of the plastic sleeve placed in the injection molding tool, and subsequently injection molding in the same injection molding tool the heads, cones or the like on both ends of the metal pin, and subsequently injecting the plastic sleeve with inserted metal pin from the tool.

1 . A method of manufacturing a plastic sleeve, particularly an expanding sleeve, in an injection molding tool, wherein a metal pin is inserted in a bore of the sleeve, and wherein the metal pin is provided on both ends thereof with heads, cones or the like composed of plastic material, the method comprising injection molding the plastic sleeve with an inserted core in an injection molding tool, subsequently pulling the core and inserting the metal pin without heads, cones or the like into the bore of the plastic sleeve placed in the injection molding tool, subsequently injection molding in the same injection molding tool the heads, cones or the like on both ends of the metal pin, and subsequently ejecting the plastic mold with inserted metal pin from the tool. 
   
   
       2 . The method according to  claim 1 , wherein the heads, cones or the like are of a plastic material having different properties than the plastic material of the plastic sleeve. 
   
   
       3 . The method according to  claim 2 , wherein the plastic sleeve is of a plastic material having a higher melting point than the plastic material used for the heads, cones or the like. 
   
   
       4 . The method according to  claim 1 , wherein, in a plastic sleeve constructed as an expanding sleeve, a cone is injection molded on one side of the metal pin within the expanding part provided partially with openings, and injection molding a head on another side of the pin outside of the plastic sleeve. 
   
   
       5 . The method according to  claim 4 , wherein the head and cone are injection molded onto the pin simultaneously. 
   
   
       6 . The method according to  claim 4 , wherein the cone is injection molded onto the pin first and the head is injection molded onto the pin subsequently. 
   
   
       7 . The method according to  claim 4 , wherein the head is injection molded onto the pin first and the cone is injection molded onto the pin subsequently. 
   
   
       8 . The method according to  claim 1 , further comprising providing the metal pin prior to insertion into the bore of the plastic sleeve with undercuts at both ends thereof.